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>Chapter 21. Debugging</H1
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><DT
><B
>Table of Contents</B
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><DT
><A
HREF="debugging.html#CHECK_LOG_FILE"
>Check Cacti Log File</A
></DT
><DT
><A
HREF="check_data_gathering.html"
>Check Basic Data Gathering</A
></DT
><DT
><A
HREF="check_cacti_poller.html"
>Check cacti's poller</A
></DT
><DT
><A
HREF="check_mysql_updating.html"
>Check MySQL updating</A
></DT
><DT
><A
HREF="check_rrd_updating.html"
>Check rrd file updating</A
></DT
><DT
><A
HREF="check_rrd_owner.html"
>Check rrd file ownership</A
></DT
><DT
><A
HREF="check_rrd_numbers.html"
>Check rrd file numbers</A
></DT
><DT
><A
HREF="check_rrd_graph.html"
>Check rrdtool graph statement</A
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><DT
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>Miscellaneous</A
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>RPM Installation?</A
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>Not NaN, but 0 (zero) values?</A
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><P
>Cacti users sometimes complain about NaN's in their graphs.
		Unfortunately, there are several reasons for this result.
		The following is a step-by-step procedure recommended for debugging.</P
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>Check Cacti Log File</A
></H1
><P
>Please have a look at your cacti log file.
			Usually, you'll find it at <TT
CLASS="FILENAME"
>&lt;path_cacti&gt;/log/cacti.log</TT
>.
			Else see <KBD
CLASS="USERINPUT"
>Settings</KBD
>, <KBD
CLASS="USERINPUT"
>Paths</KBD
>.
			Check for this kind of error:</P
><PRE
CLASS="SCREEN"
>CACTID: Host[...] DS[....] WARNING: SNMP timeout detected [500 ms], ignoring host '........'</PRE
><P
>For "reasonable" timeouts, this may be related
			to a snmpbulkwalk issue. To change this, see
			<KBD
CLASS="USERINPUT"
>Settings</KBD
>, <KBD
CLASS="USERINPUT"
>Poller</KBD
>
			and lower the value for
			<KBD
CLASS="USERINPUT"
>The Maximum SNMP OID's Per SNMP Get Request</KBD
>.
			Start at a value of 2 and increase it again,
			if the poller starts working.
			(1 or less disables snmpbulkwalk)
			Some agent's don't have the horsepower
			to deliver that many OID's at a time. Therefore,
			we can reduce the number for those older/underpowered devices.</P
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